KA2418B/28
INTRODUCTION
TONE RINGER WITH BRIDGE DIODE
The KA2418B/28 is a monolithic integrated circuit telephone tone
ringer with bridge diode, when coupled with an appropriate
transducer, it replaces the electromechanical bell. This device is
designed for use with either a piezo transducer or an inexpensive
transformer coupled speaker to produce a pleasing tone composed
of a high frequencys (f
H1
, f
H2
) alternating with a low frequency (f
S
)
resulting in a warble frequency. The supply voltage is obtained from
the AC ring signal and the circuit is designed so that noise on the
line or variation of the ringing signal can not affect correct operation
of the device.
8-DIP-300
FEATURES
•
Built-in full wave bridge diode rectifier
•
Low current consumption, in order to allow the
parallel operation of the 4 devices
•
Few external components
•
Tone and adjustable switching frequencies by
external components
•
High noise immunity due to built-in voltage to
current hysteresis
•
Adjustable activation voltage
•
Internal zener diodes to protect against over
voltages
•
Adjustable ringer impedance with external
components.
ORDERING INFORMATION
Device
KA2418B
KA2428
Package
8-DIP-300
Operating Temperature
- 20°C ~ + 70°C
APPLICATIONS
•
Electronic telephone ringers
•
Extension ringers
BLOCK DIAGRAM
RECTIFIER
CAPACITOR
7
ACTIVATION
VOLTAGE ADJUSTABLE
6
TIP
8
-
+
POWER
SUPPLY
CONTROL
CIRCUIT
LOW
FREQ OSC
HIGH
FREQ OSC
OUTPUT
AMP
5
OUTPUT
RING
1
2
GND
3
SWEEP RATE
CONTROL
CAPACITOR
4
OUTPUT FREQUENCY
CONTROL RESISTOR
Fig. 1
KA2418B/28
ABSOLUTE MAXIMUM RATINGS
Characteristic
Calling Voltage (f = 50H
Z
) Continuous
Calling Voltage (f = 50H
Z
)
5 Sec ON/10 Sec OFF
Supply Current
Operating Temperature
Storage and Junction Temperature
TONE RINGER WITH BRIDGE DIODE
Symbol
V
C
V
C(0N-OFF)
I
CC
T
ORR
T
STG
Value
120
200
22
-20 ~ +70
-65 ~ +150
Unit
Vrms
Vrms
mA
°C
°C
Absolute maximum ratings are those values beyond which permanent damage to the device may occur. These
are stress ratings only and functional operation of the device at or beyond them is not implied. Long exposure
to these conditions may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
Characteristic
Operating Voltage
Current Consumption without Lode
Activiation Voltage
Activiation Voltage Range
Sustaining Voltage
Differential Resistance in off Condition
Output Voltage Swing
Short Circuit Current
(T
a
= 25°C)
Test Conditions
-
V
S
= 8.8 to 26V
-
R
A
= 1KΩ
-
-
-
V
S
= 26V
Min
-
-
12.2
8
8
6.4
-
-
Typ
-
1.5
-
-
-
-
V
CC
-3
Symbol
V
CC
I
CC
V
ON
V
ONR
V
SUS
R
D(OFF)
V
0(P-P)
I
SC
Max
26
1.8
13
10
8.8
-
-
-
Unit
V
mA
V
V
V
KΩ
V
mA
35
AC ELECTRICAL CHARACTERISTICS
Characteristic
(T
a
= 25°C)
Test Conditions
V
CC
= 26V,R
1
= 14KΩ
V
CC
= OV
V
CC
= 6V
V
CC
= 26V,R
1
= 14KΩ
V
CC
= OV
V
CC
= 6V
R
1
=27KΩ to 1.7KΩ
R
1
=14KΩ, C1=100nF
-
0.1
-
1900
1300
-
10
-
-
15
-
HZ
HZ
KH
Z
H
Z
-
2300
1700
-
-
H
Z
H
Z
Min
Typ
Max
Unit
Symbol
f
H1
f
H2
f
H1
f
H2
f
H1R
f
S
Output Frequencies (KA2418B)
Output Frequencies (KA2428)
f
H1
Range
Sweep Frequency
Talking about work
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